What does '.030 inch undersize' mean for these bearings?

This means the inner diameter of the bearings is 0.030 inches smaller than a standard, new bearing. They are intended for use when the crankshaft journals have been machined down by 0.030 inches to correct for wear or to achieve specific oil clearances.

What is the purpose of the oil grooves on these bearings?

The oil grooves, like the 120-degree and 180-degree ones featured here, help to distribute oil evenly around the crankshaft journal. This ensures that the entire bearing surface receives adequate lubrication, reducing friction and preventing premature wear.

Are these bearings suitable for a stock crankshaft?

No, these bearings are specifically .030 inch undersize. They are designed for use with a crankshaft that has been machined down by 0.030 inches. If your crankshaft is still at standard size, you would need a standard size bearing set.

ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .30mm Oversized Main Bearing Set

Specifications

Brand: ACL
Part #: 5M7298A-30
UPC: 084777700942

ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .30mm Oversized Main Bearing Set

Name: ACL 1997+ Chevy V8 4.8/5.3/5.7/6.0 Gen 3 .30mm Oversized Main Bearing Set
Brand: ACL
Price: 25.59 USD
Availability: InStock

$25.59

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1997-2013 Corvette .030 inch oversized main bearing set by ACL. Features a 120-degree oil groove for improved lubrication.

Key Features

Fits 1997-2004 and 2006-2013 Chevrolet Corvette.
Designed for Chevrolet V8 4.8L, 5.3L, 5.7L, and 6.0L Gen 3 engines.
Main bearing set is .030 inch undersize for use with machined crankshafts.
Intermediate bearings feature a 120-degree oil groove on the upper half.
Thrust bearings have a 180-degree oil groove on the upper half for better oil distribution.

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Fits these vehicles

Chevrolet Camaro 1998-2002, 2010-2015
Chevrolet Corvette 1997-2004, 2006-2013

Product Details

When you're rebuilding or refreshing the bottom end of your 1997-2013 Chevrolet Corvette, especially those Gen 3 V8s like the 4.8L, 5.3L, 5.7L, or 6.0L, getting the main bearings right is crucial. These ACL main bearings are built to precise specifications, featuring a 120-degree oil groove on the intermediate bearings and a 180-degree groove on the thrust bearings, both located on the upper half. This design helps ensure consistent oil flow to the crankshaft journals, which is vital for reducing friction and wear.

This set is .030 inches undersize, meaning it's intended for crankshafts that have been machined down by that amount to correct for wear or to achieve a specific clearance. ACL is known for making well-built engine components, and these bearings are no exception. Proper installation with the correct oil clearances is key to their performance and longevity, so make sure to follow your service manual's guidelines.